The Effect of Growth Rate on the Microstructure and Mechanical Properties of 7020 Alloys
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, cilt.31, sa.2, ss.1622-1630, 2022 (SCI-Expanded)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 31 Sayı: 2
- Basım Tarihi: 2022
- Doi Numarası: 10.1007/s11665-021-06298-8
- Dergi Adı: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
- Sayfa Sayıları: ss.1622-1630
- Anahtar Kelimeler: 7020 alloy, compressive yield strength, dendritic spacings, fracture surface analysis, microhardness, ultimate tensile strength
- Erciyes Üniversitesi Adresli: Evet
Özet
The 7020 aluminum alloy is one of the hardenable Al-Zn-Mg based alloys, which are a family of high strength aluminum alloys. These 7020 alloys are commonly used in the aircraft and automotive industries. The microstructural changes have a significant impact on the mechanical properties of binary and multi-component alloys. For this reason, 7020 aluminum alloys were prepared with different growth rates on account of the changes in the microstructures; thus, directionally solidification processes were actualized with a Bridgman furnace at five various growth rates (V = 8.3-166.0 mu m/s) and at constant temperature gradient (G = 8.3 K/mm). Microhardness (HV), ultimate tensile strength (sigma(U)) and yield strength (sigma(y)) of the solidified alloys were determined. The HV increased from 758.8 to 917.1 N/mm(2), the sigma(U) from 125.4 to 208.1 N/mm(2) and the sigma(y) from 133.7 to 230.8 N/mm(2) with an increase in growth rate from 8.3 to 166.0 mu m/s.